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JOHN GRIFFIN, O F REDDING, CONNECTICUT.

Leners Pawn: No. 95,678, dated oczbber 12, 1869.

COAL-Asn srrren.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom Iit may conce/rnv Be it known that I, J OHN L. GRIFFIN, of the town of Redding, county of Fairfield, and State yof Connecticut, have invented a new and useful Improvement in the Construction of Coal-Ash -Sifters g, and I do hereby declare that the following is a full and correct description thereof, reference being had to the accompanying drawing, and to the letters of referencey marked thereon.

The nature of my invention consists in the arrangement of a revolving cylinder or wire-work screen, with head of a barrel, which will, when in'operation, receive 7all the fine ashes or dust, and at the same time the cinders or coal will, after being sifted,.pass out through a spout into a scuttle hung on a-hook at the back of thebox. Y

I construct the box A of wood, in form similar to the drawings, figs. l and 2.

The sieve B is composed of wire-work, with internal hoops or ribs and arms to receive the spindle Gr, which passes through the centre to a bearing, D, at the furth`er end, and runs on the bearingE at the front end, with a crank, F, to revolve the same.`

On the front end, close to the crank, I attach an endless screw, G. This endless screw works in a gearwheel, H, and causes it to revolve in connection with a grooved pulley, I attached to it.

, A chain, N, or its equivalent, is fastened to this pulley, I, which runs up to the pulley K under the lid of the box A, and passes into the box, to the further end of the self-feedihg bottom'L of the hopper. When the crank revolves the endless screw and attachments, the chainN will wind up on-the pulley I, and raise up the back part of the bottom L, lwhich will gradually, as it rises, pour the coal 'downthrough the mouth of v the hopper into. the wire cylinder, to be sifted, and after it has risen up a proper distance to empty all the coal, it willpress-against the end of the rodv M, which will slide forward to press oi the rod O R in front from the catch S, which holds up the gear and pulley to the endless screw by the spiral spring P, and being connected with the pulley and other bearings,

will fall down sufticiently to throw the endless screw i out of gear 4with the gear-wheel H and pulley I, and falling down suddenly, relieve the chain N, and the bottom L instantly falls down into its place, ready to receiveauother batch of coal. The rod Ris then brought down under the catch S, which brings up the gear-wheel H into the thread of the'endless screw again for another operation.

The utility of-my rotary sieve isthat it can be used in the house Without making a dust while in operation, and being self-feeding, it is only necessary to put in the coal to the hopper, and put down the lid, and

Vthe bottom will gradually feed it.

What I claim as my invention, and desire to secure by Letters Patent, is- The arrangement of the self-feeding bottom L,'iu combination with the endless screw G, pulley and gear H I, chain N, rod andcatch M O, and spring P,

' inthe mannersubstantially as and for the purpose set forth.

JOHN L. GRIFFIN.

Witnesses W. VINE, ANDREW SELLECK. 

